Pulley-block.



R. BROWN;

PULLEY BLOCK.

APPLICATION FILED MAR. 25. 1914.

Patented June 8, 1915.

2 SHEETS-SHED 1.

R. BROWN.

PULLEY BLOCK.

APPLICATION FILED MAR. 25, 1914.

Patented June 8, 1915.

2 SHEETS-SHEET 2.

THE NORRIS PETERS 60.. PHOTG-LITHQ, WASHINGTON, u. u.

ROBERT BROWN, OF CRAIGTON, GLASGOW, SCOTLAND.

PULLEY-BLOGK.

Specification of Letters Patent.

Patented June 8, 1915..

Application filed March 25, 1914. Serial No. 827,029.

To all whom it may concern:

Be it known that I, ROBERT BROWN, a sub: ject of the King of GreatBritain, residing at Craigton, Glasgow, Scotland, have invented certainnew and useful Improvements in Pulley-Blocks, of which the following isa specification.

This invention relates to pulley blocks such as are used in connectionwith raising and lowering tackle for boats and other purposes and it hasfor its object to improve the construction of such blocks.

Under my invention in place of making the pulley block with a sheave orsheaves as hitherto, I substitute for the sheave or sheaves anarrangement or arrangements of rollers or their equivalent fitted in thecheeks of the block.

In order that my said invention may be properly understood I havehereunto appended an explanatory sheet of drawings whereon is shown, byway of illustration or example, a pulley block as made under theinvention. I

On the drawings :Figure 1 is a side view of a pulley block constitutedby a standing block and a running block which serves the same purpose asan ordinary double sheave pulley block. Fig. 2 is an end view of same.Figs. 3 and 4 are detail views of rollers. Fig. 5 is a side view of aslightly modified construction of pulley block.

In carrying out my invention, as illus trated at Figs. 1 and 2, I makethe cheeks a of the block of a somewhat semicircular shape or formationthough they may be of any other convenient shape or formation, for thereception of one or more series of rollers b or their equivalent whichare mounted on spindles 0 fitted in the cheeks a. The spindles o forsupporting the rollers or their equivalent are arranged semicircularlyin the cheeks a of the block to take the place of the working portion ofthe ordinary sheave, z. e. the part of same actually in contact with therope or its equivalent d. When the block is used in lieu of the usualdouble sheave block two series of rollers 79 are used, as illustrated,each series being graduated or varied in diameter to such an extent asto prevent the ropes or their equivalent (Z fouling when in operation.When used in lieu of an ordinary triple sheave block three series ofrollers I) would be used.

With a pulley block as constructed under this invention, for use, forexample, in connection with boat lowering gear, each series of rollersZ) fitted in the cheeks a of the block are arranged vertically one abovethe other and varied in size sufiiciently to prevent the ropes or theirequivalent d contacting or fouling when the gear is in opera tion. Apulley block constructed in this manner has the'advantage that itrequires less head room than the ordinary block, moreover, the twohalves can be constructed,

as shown, so that they can be broughtdirectly into contact with eachother,thereby saving space, while the lengths of rope or equivalent (Zhang downward in line with each other thereby preventing twisting of thetackle such as generally takes place when the ordinary double or triplepulleyblock is used.

In Figures 1, 2 and 3, the rollers b are secured to or made'one with thespindle 0 which revolve in the cheeks a of the block while in Fig. 4,the spindle 0 is so madethat the roller 72 revolves thereon, the ends ofthe b semicircularly, as shown at Figs. 1 and 2, each series may bearranged in a straightv spindle 0 being preferably squared or other Iline of gradually increasing length, as illustrated at Fig. 5.

Having now fully described my invention,

what I claim and desire to secure by Letters Patent is:

1. In a device of the character stated, a pair of blocks, one a standingblock, and the other a running block, a plurality of 'rows of rollersarranged one above the other in each block, each roller being mounted ona separate and independent axis, and a rope attached at its one end toone block and passing over the rows of rollers of both blocks.

2. In a device of the character stated, a pair of blocks, one a standingblock and the other a running block, a plurality of rows of rollersarranged one above the other in each block and forming sheaves ofdifferent diameters, each roller being mounted on a separate andindependent axis, and a rope attached at its one end to one block andpassing over the rows of rollers of both blocks. r r

3. In a device of the character stated, a

pair of blocks, one a standing block and the other arunning block, aplurality of roWs of rollers arranged one above the other in each block,each roller being of the same diameter and mounted on a separate andindependent aXis the rows of rollers forming sheaves of differentdiameters, and a rope attached at its one end to one block and passingover the rows ofrollers of both blocks.

4. In a device of the character stated, a pair of blocks, one a standingblock and the other a running block, a plurality of rows ofindependently and separately mounted rollers arranged one above theother in curved roWs in each block, and a rope attached at its one endto one block and pass ing over the rows of rollers of both blocks.

5. In a device of the character stated, a pair of blocks, one a standingblock and the other a running block, a plurality of roWs ofindependently and separately mounted rollers arranged one above theother in curved rows in each block, each roller being of the samediameter and the rows of rollers forming sheaves of different diameters,and a rope attached at its one end to one block and passing over therows of rollers of both blocks.

6. In a device of the character stated, a pair of blocks, one a standingblock and the other a running block, a plurality of concentric rows ofindependently and separately mounted rollers arranged one above theother in each block, and a rope attached at its one end to one block andpassing over the rows of rollers of both blocks.

7. In a device of the character stated, a pair of blocks, one a standingblock and the other a running block, a plurality of concentric rows ofindependently and separately mounted rollers, arranged one above theother in each block, each roller being of the same diameter, and a ropeattached at its one end to one block, and passing over the roWs orrollers of both blocks.

8. In a device of the character stated, a pair of semi-circular blocks,one a standing block and the other a running block, a plurality of rowsof rollers arranged one above the other in each block and formingsheaves of different diameters, each roller being mounted on a separateand independent axis, and a rope attached at its one end to one blockand passing over the'roWs of rollers of both blocks.

9. In a device of the character stated, a pair of semi-circular blocks,a plurality of rows of rollers arranged one above the other in eachblock, each roller being of the same diameter and mounted on a separateand independent axis, the rows of rollers forming sheaves of differentdiameters, and a rope attached at its one end to one block and passingover the roWs of rollers of both blocks.

In testimony whereof I affix my signature in presence of tWo Witnesses.

ROBERT BROWN.

Witnesses IVILLIAM FLEMING, WILLIAM CARRUTHERs.

copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents Washington, I). G.

